Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ed9eede929f54…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 19:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2c3eda91195c7a12506b63d6435c31b SHA-1: a3a4fec2fa13713297d288c6f739576589128224 SHA-256: a85ed9eede929f54d95e4aee73a6aad0abcfefea6499daa309d123d5c61af10e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=apple+cider+vinegar+for+weight+loss+before+bed PDF link annotation
    • https://marwaautorepair.com/nbloom/fckuploads/file/39192947068.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf719c9e4---32809678874.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/refet.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/dofuvakeb.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gosuzixivonunez.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/99720828659.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/feximipofufuzugi.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/39059839307.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/jekogiputadafebofovosi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/38295348494.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/86369780718.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wixaletopulasularojepub.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/86713940449.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/luvufewab.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/18807685735.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/lusoza.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/75e6d2cda8d81475f20b80ae04c60495/16627722212.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/14827574090.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210905054535.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dijufidejixexijafetowijaj.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/54338002635.pdfIn PDF document text
    • http://superazs.ru/images/news/file/4363507258.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/pudozavas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 17096 bytes
SHA-256: d72c82a77b4dd0fa93a72503a92c3799155e6d74e8582bfd87a8e8ff7f33622d
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 11172 bytes
SHA-256: bdb07e84b1becd97b3c17c17f6294f133838a293c581d334c0644afcace5c92b
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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